What is hand over fist?

The phrase "hand over fist" is an idiom that is often used to describe something that is happening rapidly or in large amounts, particularly in the context of making money. When someone says they are making money "hand over fist," it implies that they are doing so quickly and efficiently, accumulating wealth at a fast pace. The expression likely originates from the imagery of someone continuously pulling a rope hand over hand, suggesting a swift and repeated action. This idiom can also be applied more broadly to describe any rapid accumulation or progress, not limited to financial contexts.